Plasma and energetic electron flux variations in the Mercury 1 C event - Evidence for a magnetospheric boundary layer

Physics

Scientific paper

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Boundary Layer Plasmas, Magnetospheric Electron Density, Mariner 10 Space Probe, Mercury Atmosphere, Planetary Magnetospheres, High Energy Electrons, High Temperature Plasmas, Magnetic Flux, Magnetopause, Plasma Diagnostics, Space Plasmas, Mercury (Planet), Plasma, Electrons, Flux, Magnetosphere, Boundaries, Magnetopause, Mariner 10, Spacecraft Observations, Charged Particles, Magnetic Fields, Thickness, Timescale, Comparisons, Diagrams, Layers, Storms, Cpe Intrument, Analysis, Laboratory Studies, Equipment

Scientific paper

Charge-particle and magnetic-field data obtained during the first encounter (on March 29, 1974) of Mariner 10 with the planet Mercury are reexamined, and a new interpretation of the Mariner 10 energetic electron, plasma electron, and magnetic field data near the outbound magnetopause at Mercury is presented. It is shown that Mariner 10 sampled the hot substorm energized magnetospheric plasma sheet for the first 36 sec of the C event and, for the next 48 sec, alternatiely sampled hot (plasma sheet) and cold (boundary-layer magnetosheathlike) plasma regions. It is argued that the counting rate of the ID1 event (i.e., a particle event triggering detector D1 but not the D2, D3, or D7 detectors) thoughout the C event most probably represents a pulse pileup response to about 35-175 keV electrons, rather than the nominal above-175 keV electrons presumed in the earlier interpretations.

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